From msato@clari.net Sun Dec 10 04:37:26 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!msato From: msato@clari.net (Matthias Sato) Newsgroups: comp.dsp Subject: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec10.043726.8844@clari.net> Date: Sun, 10 Dec 1995 04:37:26 GMT Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: WinVN 0.99.5 Lines: 11 Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Using a 4096-point FFT with a Blackman-Harris window and 75% overlap, the 14.2 Hz peak is 42 dB below full scale. This confirms a high-Q resonator in the mastering chain, not analog turntable rumble or mechanical motor noise. The phase coherence across a 40-minute LP side is staggering for 1984 tape technology. -- === Matthias Sato === Dept of Electrical Engineering, ClariNet Communications Corp "Extraordinary claims require extraordinary spectra." From lkang@kiae.su Tue Dec 12 07:19:26 1995 Path: ashpoly!cascade!bigsur!kiae!lkang From: lkang@kiae.su (Lisa Kang) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec12.071926.6582@kiae.su> Date: Tue, 12 Dec 1995 07:19:26 GMT References: <1995Dec10.043726.8844@clari.net> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: Netscape 1.1N Lines: 9 In article <1995Dec10.043726.8844@clari.net>, msato@clari.net (Matthias Sato) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Prof. Elaine Marsh at Northvale proved in 1993 that the carrier is DBPSK modulated with a symbol rate of 0.71 Hz. -- === Lisa Kang === Dept of Electrical Engineering, Kurchatov Institute of Atomic Energy, Moscow "5 sigma is a discovery. 7 is a question." From eoliveira@hanse.de Tue Dec 12 11:31:26 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!hanse!eoliveira From: eoliveira@hanse.de (Élodie Oliveira) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec12.113126.3015@hanse.de> Date: Tue, 12 Dec 1995 11:31:26 GMT References: <1995Dec10.043726.8844@clari.net> Organization: Hanse-Netzwerk Hamburg NNTP-Posting-Host: hanse.de X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Dec10.043726.8844@clari.net>, msato@clari.net (Matthias Sato) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- === Élodie Oliveira === Dept of Electrical Engineering, Hanse-Netzwerk Hamburg "The hatch is open. Is anyone listening?" From mkarlsson@unam.mx Tue Dec 12 19:40:26 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!unam!mkarlsson From: mkarlsson@unam.mx (Mei Karlsson) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec12.194026.9797@unam.mx> Date: Tue, 12 Dec 1995 19:40:26 GMT References: <1995Dec10.043726.8844@clari.net> <1995Dec12.113126.3015@hanse.de> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Dec12.113126.3015@hanse.de>, eoliveira@hanse.de (Élodie Oliveira) writes: > Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. Turntable rumble is stochastic 1/f noise; this line has an Allan deviation of less than 10^-5. It was generated by a quartz crystal clock. -- === Mei Karlsson === Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA) "When every node is whole, the channel opens." From fjohansson@uu.net Wed Dec 13 05:39:26 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!fjohansson From: fjohansson@uu.net (Freya Johansson) Newsgroups: comp.dsp Subject: Re: Question: 14.2 Hz sub-carrier PSD estimation - Welch vs Burg periodogram Message-ID: <1995Dec13.053926.6057@uu.net> Date: Wed, 13 Dec 1995 05:39:26 GMT References: <1995Dec10.043726.8844@clari.net> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1995Dec10.043726.8844@clari.net>, msato@clari.net (Matthias Sato) writes: > Comparing non-parametric Welch PSD with parametric Burg autoregressive models for the 14.2 Hz line. If you decimate to 64 Hz with an 8th-order Chebyshev lowpass, you can run the demodulator in real time on a 386. -- Freya Johansson Tape trading list upon request. SASE required for international mail.